u-boot/board/ti/common/board_detect.c
Cooper Jr., Franklin e25ae3224f ti: common: board_detect: Set alen to expected value before i2c read
In non DM I2C read operations the address length passed in during a read
operation will be used automatically. However, in DM I2C the address length
is set to a default value of one which causes problems when trying to
perform a read with a differing alen. Therefore, before the first read in a
series of read operations set the alen to the correct value.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
2017-05-09 09:04:39 +02:00

435 lines
9.7 KiB
C

/*
* Library to support early TI EVM EEPROM handling
*
* Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
* Lokesh Vutla
* Steve Kipisz
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/omap_common.h>
#include <dm/uclass.h>
#include <i2c.h>
#include "board_detect.h"
#if defined(CONFIG_DM_I2C_COMPAT)
/**
* ti_i2c_set_alen - Set chip's i2c address length
* @bus_addr - I2C bus number
* @dev_addr - I2C eeprom id
* @alen - I2C address length in bytes
*
* DM_I2C by default sets the address length to be used to 1. This
* function allows this address length to be changed to match the
* eeprom used for board detection.
*/
int __maybe_unused ti_i2c_set_alen(int bus_addr, int dev_addr, int alen)
{
struct udevice *dev;
struct udevice *bus;
int rc;
rc = uclass_get_device_by_seq(UCLASS_I2C, bus_addr, &bus);
if (rc)
return rc;
rc = i2c_get_chip(bus, dev_addr, 1, &dev);
if (rc)
return rc;
rc = i2c_set_chip_offset_len(dev, alen);
if (rc)
return rc;
return 0;
}
#else
int __maybe_unused ti_i2c_set_alen(int bus_addr, int dev_addr, int alen)
{
return 0;
}
#endif
/**
* ti_i2c_eeprom_init - Initialize an i2c bus and probe for a device
* @i2c_bus: i2c bus number to initialize
* @dev_addr: Device address to probe for
*
* Return: 0 on success or corresponding error on failure.
*/
static int __maybe_unused ti_i2c_eeprom_init(int i2c_bus, int dev_addr)
{
int rc;
if (i2c_bus >= 0) {
rc = i2c_set_bus_num(i2c_bus);
if (rc)
return rc;
}
return i2c_probe(dev_addr);
}
/**
* ti_i2c_eeprom_read - Read data from an EEPROM
* @dev_addr: The device address of the EEPROM
* @offset: Offset to start reading in the EEPROM
* @ep: Pointer to a buffer to read into
* @epsize: Size of buffer
*
* Return: 0 on success or corresponding result of i2c_read
*/
static int __maybe_unused ti_i2c_eeprom_read(int dev_addr, int offset,
uchar *ep, int epsize)
{
int bus_num, rc, alen;
bus_num = i2c_get_bus_num();
alen = 2;
rc = ti_i2c_set_alen(bus_num, dev_addr, alen);
if (rc)
return rc;
return i2c_read(dev_addr, offset, alen, ep, epsize);
}
/**
* ti_eeprom_string_cleanup() - Handle eeprom programming errors
* @s: eeprom string (should be NULL terminated)
*
* Some Board manufacturers do not add a NULL termination at the
* end of string, instead some binary information is kludged in, hence
* convert the string to just printable characters of ASCII chart.
*/
static void __maybe_unused ti_eeprom_string_cleanup(char *s)
{
int i, l;
l = strlen(s);
for (i = 0; i < l; i++, s++)
if (*s < ' ' || *s > '~') {
*s = 0;
break;
}
}
__weak void gpi2c_init(void)
{
}
static int __maybe_unused ti_i2c_eeprom_get(int bus_addr, int dev_addr,
u32 header, u32 size, uint8_t *ep)
{
u32 byte, hdr_read;
int rc;
gpi2c_init();
rc = ti_i2c_eeprom_init(bus_addr, dev_addr);
if (rc)
return rc;
/*
* Read the header first then only read the other contents.
*/
byte = 2;
rc = ti_i2c_set_alen(bus_addr, dev_addr, byte);
if (rc)
return rc;
rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read, 4);
if (rc)
return rc;
/* Corrupted data??? */
if (hdr_read != header) {
rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read, 4);
/*
* read the eeprom header using i2c again, but use only a
* 1 byte address (some legacy boards need this..)
*/
byte = 1;
if (rc) {
rc = ti_i2c_set_alen(bus_addr, dev_addr, byte);
if (rc)
return rc;
rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read,
4);
}
if (rc)
return rc;
}
if (hdr_read != header)
return -1;
rc = i2c_read(dev_addr, 0x0, byte, ep, size);
if (rc)
return rc;
return 0;
}
int __maybe_unused ti_i2c_eeprom_am_get(int bus_addr, int dev_addr)
{
int rc;
struct ti_am_eeprom am_ep;
struct ti_common_eeprom *ep;
ep = TI_EEPROM_DATA;
#ifndef CONFIG_SPL_BUILD
if (ep->header == TI_EEPROM_HEADER_MAGIC)
return 0; /* EEPROM has already been read */
#endif
/* Initialize with a known bad marker for i2c fails.. */
ep->header = TI_DEAD_EEPROM_MAGIC;
ep->name[0] = 0x0;
ep->version[0] = 0x0;
ep->serial[0] = 0x0;
ep->config[0] = 0x0;
rc = ti_i2c_eeprom_get(bus_addr, dev_addr, TI_EEPROM_HEADER_MAGIC,
sizeof(am_ep), (uint8_t *)&am_ep);
if (rc)
return rc;
ep->header = am_ep.header;
strlcpy(ep->name, am_ep.name, TI_EEPROM_HDR_NAME_LEN + 1);
ti_eeprom_string_cleanup(ep->name);
/* BeagleBone Green '1' eeprom, board_rev: 0x1a 0x00 0x00 0x00 */
if (am_ep.version[0] == 0x1a && am_ep.version[1] == 0x00 &&
am_ep.version[2] == 0x00 && am_ep.version[3] == 0x00)
strlcpy(ep->version, "BBG1", TI_EEPROM_HDR_REV_LEN + 1);
else
strlcpy(ep->version, am_ep.version, TI_EEPROM_HDR_REV_LEN + 1);
ti_eeprom_string_cleanup(ep->version);
strlcpy(ep->serial, am_ep.serial, TI_EEPROM_HDR_SERIAL_LEN + 1);
ti_eeprom_string_cleanup(ep->serial);
strlcpy(ep->config, am_ep.config, TI_EEPROM_HDR_CONFIG_LEN + 1);
ti_eeprom_string_cleanup(ep->config);
memcpy(ep->mac_addr, am_ep.mac_addr,
TI_EEPROM_HDR_NO_OF_MAC_ADDR * TI_EEPROM_HDR_ETH_ALEN);
return 0;
}
int __maybe_unused ti_i2c_eeprom_dra7_get(int bus_addr, int dev_addr)
{
int rc, offset = 0;
struct dra7_eeprom dra7_ep;
struct ti_common_eeprom *ep;
ep = TI_EEPROM_DATA;
#ifndef CONFIG_SPL_BUILD
if (ep->header == DRA7_EEPROM_HEADER_MAGIC)
return 0; /* EEPROM has already been read */
#endif
/* Initialize with a known bad marker for i2c fails.. */
ep->header = TI_DEAD_EEPROM_MAGIC;
ep->name[0] = 0x0;
ep->version[0] = 0x0;
ep->serial[0] = 0x0;
ep->config[0] = 0x0;
ep->emif1_size = 0;
ep->emif2_size = 0;
rc = ti_i2c_eeprom_get(bus_addr, dev_addr, DRA7_EEPROM_HEADER_MAGIC,
sizeof(dra7_ep), (uint8_t *)&dra7_ep);
if (rc)
return rc;
ep->header = dra7_ep.header;
strlcpy(ep->name, dra7_ep.name, TI_EEPROM_HDR_NAME_LEN + 1);
ti_eeprom_string_cleanup(ep->name);
offset = dra7_ep.version_major - 1;
/* Rev F is skipped */
if (offset >= 5)
offset = offset + 1;
snprintf(ep->version, TI_EEPROM_HDR_REV_LEN + 1, "%c.%d",
'A' + offset, dra7_ep.version_minor);
ti_eeprom_string_cleanup(ep->version);
ep->emif1_size = (u64)dra7_ep.emif1_size;
ep->emif2_size = (u64)dra7_ep.emif2_size;
strlcpy(ep->config, dra7_ep.config, TI_EEPROM_HDR_CONFIG_LEN + 1);
ti_eeprom_string_cleanup(ep->config);
return 0;
}
bool __maybe_unused board_ti_is(char *name_tag)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
if (ep->header == TI_DEAD_EEPROM_MAGIC)
return false;
return !strncmp(ep->name, name_tag, TI_EEPROM_HDR_NAME_LEN);
}
bool __maybe_unused board_ti_rev_is(char *rev_tag, int cmp_len)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
int l;
if (ep->header == TI_DEAD_EEPROM_MAGIC)
return false;
l = cmp_len > TI_EEPROM_HDR_REV_LEN ? TI_EEPROM_HDR_REV_LEN : cmp_len;
return !strncmp(ep->version, rev_tag, l);
}
char * __maybe_unused board_ti_get_rev(void)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
/* if ep->header == TI_DEAD_EEPROM_MAGIC, this is empty already */
return ep->version;
}
char * __maybe_unused board_ti_get_config(void)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
/* if ep->header == TI_DEAD_EEPROM_MAGIC, this is empty already */
return ep->config;
}
char * __maybe_unused board_ti_get_name(void)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
/* if ep->header == TI_DEAD_EEPROM_MAGIC, this is empty already */
return ep->name;
}
void __maybe_unused
board_ti_get_eth_mac_addr(int index,
u8 mac_addr[TI_EEPROM_HDR_ETH_ALEN])
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
if (ep->header == TI_DEAD_EEPROM_MAGIC)
goto fail;
if (index < 0 || index >= TI_EEPROM_HDR_NO_OF_MAC_ADDR)
goto fail;
memcpy(mac_addr, ep->mac_addr[index], TI_EEPROM_HDR_ETH_ALEN);
return;
fail:
memset(mac_addr, 0, TI_EEPROM_HDR_ETH_ALEN);
}
u64 __maybe_unused board_ti_get_emif1_size(void)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
if (ep->header != DRA7_EEPROM_HEADER_MAGIC)
return 0;
return ep->emif1_size;
}
u64 __maybe_unused board_ti_get_emif2_size(void)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
if (ep->header != DRA7_EEPROM_HEADER_MAGIC)
return 0;
return ep->emif2_size;
}
void __maybe_unused set_board_info_env(char *name)
{
char *unknown = "unknown";
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
if (name)
setenv("board_name", name);
else if (ep->name)
setenv("board_name", ep->name);
else
setenv("board_name", unknown);
if (ep->version)
setenv("board_rev", ep->version);
else
setenv("board_rev", unknown);
if (ep->serial)
setenv("board_serial", ep->serial);
else
setenv("board_serial", unknown);
}
static u64 mac_to_u64(u8 mac[6])
{
int i;
u64 addr = 0;
for (i = 0; i < 6; i++) {
addr <<= 8;
addr |= mac[i];
}
return addr;
}
static void u64_to_mac(u64 addr, u8 mac[6])
{
mac[5] = addr;
mac[4] = addr >> 8;
mac[3] = addr >> 16;
mac[2] = addr >> 24;
mac[1] = addr >> 32;
mac[0] = addr >> 40;
}
void board_ti_set_ethaddr(int index)
{
uint8_t mac_addr[6];
int i;
u64 mac1, mac2;
u8 mac_addr1[6], mac_addr2[6];
int num_macs;
/*
* Export any Ethernet MAC addresses from EEPROM.
* The 2 MAC addresses in EEPROM define the address range.
*/
board_ti_get_eth_mac_addr(0, mac_addr1);
board_ti_get_eth_mac_addr(1, mac_addr2);
if (is_valid_ethaddr(mac_addr1) && is_valid_ethaddr(mac_addr2)) {
mac1 = mac_to_u64(mac_addr1);
mac2 = mac_to_u64(mac_addr2);
/* must contain an address range */
num_macs = mac2 - mac1 + 1;
if (num_macs <= 0)
return;
if (num_macs > 50) {
printf("%s: Too many MAC addresses: %d. Limiting to 50\n",
__func__, num_macs);
num_macs = 50;
}
for (i = 0; i < num_macs; i++) {
u64_to_mac(mac1 + i, mac_addr);
if (is_valid_ethaddr(mac_addr)) {
eth_setenv_enetaddr_by_index("eth", i + index,
mac_addr);
}
}
}
}